Scientists have found that first-born children are smarter than their brothers and sisters. It appears they are more likely to succeed in business, too.Be it drive or aptitude or a slightly higher IQ, the advantage crosses gender and international lines. Microsoft msft CEO Steve Balmer is an eldest child, as is Avon's avp Andrea Jung. Charles Schwab, schw the oldest of two, overcame dyslexia to become one of the world's richest. Joe Moglia, CEO of TD Ameritrade, amtd was first-born of five and...Full Story